230404-N-GB257-004 Sullivan's Island, SC (April 4, 2023) Personnel participating in a communications test event on Sullivan’s Island equip a tethered, balloon-like aerostat with radio equipment on April 4 to support Naval Information Warfare Center (NIWC) Atlantic and Naval Surface Warfare Center (NSWC) Crane manned and unmanned surface vessels navigating the Charleston Harbor and Atlantic coastline. (U.S. Navy photo by Joe Bullinger/Released)